Add store utils

src/utils/index.js

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+export {default as store} from './store'

src/utils/store.js

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+const NAMESPACE = 'emoji-picker'
+
+function update(state) {
+  for (let key in state) {
+    let value = state[key]
+    set(key, value)
+  }
+}
+
+function set(key, value) {
+  if (!('localStorage' in window)) return
+  window.localStorage[`${NAMESPACE}.${key}`] = JSON.stringify(value)
+}
+
+function get(key) {
+  if (!('localStorage' in window)) return
+
+  var value = window.localStorage[`${NAMESPACE}.${key}`]
+
+  if (value) {
+    return JSON.parse(value)
+  }
+}
+
+export default { update, set, get }